AP File PhotosCarl Edwards, left, and Brad Keselowski tangled March 7 at Atlanta, and fans are waiting to see what else happens between the drivers. JACKSON -- When NASCAR officials made the decision to lighten up on the drivers and allow bump drafting and more banging on the race track in 2010, they knew they were inviting more aggressive driving.

NASCAR decided to make feuds cool again, and there's a couple good ones brewing as the series arrives at Michigan International Speedway in Brooklyn this week.

Take Joey Logano's run-in with Kevin Harvick on Sunday at Pocono that produced the latest I'm-gonna-get-you storyline.

Then there's Denny Hamlin, who had no trouble putting teammate Kyle Busch into the wall at the all-star race last month.

Even teammates and champions Jimmie Johnson and Jeff Gordon have had their moments this season.

The biggest feud of the season, however, might be the one between Brad Keselowski and Carl Edwards. It has had many fans waiting for the next shoe to drop since the two first tangled March 7 at Atlanta, where a well-timed and well-placed tap by Edwards sent Keselowski's car flying into the catch fence.

Keselowski, a native of Rochester Hills, comes home for Sunday's Heluva Good! Sour Cream Dips 400 with a cooler head than he showed at Atlanta.

2. Denny Hamlin vs. Kyle Busch: The teammates weren't exactly sounding like friends after Hamlin took out Busch at the all-star race last month.

3. Joey Logano vs. Kevin Harvick: Logano wanted a piece of Harvick after a wreck last weekend at Pocono. The next round in the battle takes place Sunday at Michigan.

4. Jimmie Johnson vs. Jeff Gordon: The losing streak has been frustrating to Hendrick teammates. Hard racing between the two at Texas in April left Gordon wondering, "Where's the love?"

"I don't get upset about things like that because I think it's really important to not get upset," Keselowski said. "It's unhealthy."

Keselowski also cautioned fans at Michigan not to get too caught up into what might happen on the 2-mile oval in Brooklyn -- at least between him and Edwards.

"A lot's been said over the last three or four months about rivalries in the sport and how it's good for it and all that, but it's really hard to have rivalries because there's more depth to the field than there's ever been," Keselowski said. "With that, it means you rarely see the guy. I've run six or seven races now and I haven't even seen Carl on the race track.

"It's hard to really have a rivalry when you're spread out like that and you're racing with other good drivers."

Keselowski said the best way to get back at anybody in racing is just point to the scoreboard after the race.

"I wouldn't say I was happy with the way things went at Atlanta, but I haven't spent a lot of time trying to prepare any way to retaliate or anything like that," Keselowski said. "The best retaliation there is for me right now is to be running up front, getting solid finishes on the Cup side, leading the Nationwide Series in points.

"That's like its own retaliation. That means a lot to me."

Keselowski, who is in his first full season in Sprint Cup, comes to Michigan 24th in the series points driving for Penske Racing. He's leading the Nationwide Series, but he's looking for his first top-10 finish in the Cup season.

It's not easy climbing that points ladder, Keselowski acknowledged, and that leads to some close, or perhaps desperate, moves on the race track.

"The only way to climb the pecking order is to claw your way up it and prove to them that you're not going to tolerate or accept being at the bottom of it," Keselowski said. "Naturally, there's going to be some negative feedback from some of that. But that's the reality of the sport."

Keselowski added the safety record of today's cars adds to the drivers' confidence to make bold moves that can result in damaged cars.

"We are Supermen out there," Keselowski said. "We can run really hard, get out of the car and drive it the next day. The injuries that are happening to drivers now are happening off the track, between Frisbees and basketball games."